^ Jump up to: a b Joseph O. Falkinham III; Elizabeth D. Hilborn; Matthew J. Arduino; Amy Pruden; Marc A. Edwards (August 2015). "Epidemiology and Ecology of Opportunistic Premises Plumbing Pathogens: Legionella pneumophila, Mycobacterium avium, and Pseudomonas aeruginosa". Environ Health Perspectives;. 123 (8). doi:10.1289/ehp.1408692. Archived from the original on May 31, 2015. Retrieved August 1, 2015.
There’s a reason we’ve earned the title of “The Smell Good Plumber.” Our Phoenix plumbers take pride in every aspect of their work – from the job they do to their appearance and cleanliness while on the job. When you contract our company for a job, you can expect our professional technicians to be just that – professional. Our technicians will show up at your home or business with a clean and neat appearance. You don’t have to worry about the stereotypical, inappropriate plumber’s garb with our professionals. You also don’t have to worry about them leaving a big mess behind. They’ll make sure to clean up after a job has been completed, so you can just sit back, relax, and let us do the work.
The introduction of the first water-retaining traps or seals in the 1850s, and the common use of "U"-shaped traps in the 1870s, were major steps forward. The design of the trap ensured that enough water remained in it to effectively block the passage of sewer gas back through the plumbing fixtures. During the 1870s vent pipes were introduced. They not only carried sewer gas out of the system, but also broke the suction created by movement of liquid in the pipes and eliminated the possibility of siphoning water that sealed the traps.

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